OWL at Purdue for more information on abbreviations.
Abbreviate months names longer than four letters used in journal and magazine citations. Use period.
MLA suggests a few rules for you to follow when abbreviating publishers:
Abbreviate geographic names of states and countries in book citations when the publisher's city is not well known or could be confused with another city. Abbreviate country, province, and state names.
Use common two letter state abbrevations, all upper case: